Means for maintaining the strength of refrigerating liquids.



No. 851,121. PATBNTED APR. 23, 1907. A. P. GRISWELL & A. 0. BISHOP.MEANS FOR MAINTAINING THE STRENGTH 0F REFRIGERATING LIQUIDS.

APPLICATION FILED JAN. 26, 1905.

[NVE/VTORS y ATTORNEY UNITED STATES PATENT oEEioE.

ALEXANDER P. ORISWELL, OF AURORA, INDIANA, AND ALBERT O. BISHOP,

or CLEVELAND, OHIO.

MEANS FOR MAINTAINING THE STRENGTH 0F REFRIGERATING LIQUIDS.

Specification of Letters Patent.

Patented April 23, 1907.

Application filed January 26, 1905. Serial No. 242,738.

To all whom, it may concern.-

Be it known that we, ALEXANDER P. CR Is 1 WELL, a citizen of the UnitedStates, residing at Aurora, in the county of Dearborn and State ofIndiana, and ALBERT O. BrsHoP, a citizen of the United States, residingat Cleveland, in the county of Cuyahoga and State of Ohio, have inventedcertain new and useful Improvements in Means for Maintaining theStrength of Refrigerating or Cooling Mediums and we do declare that thefollowing is afull, clear, and exact description of the invention, whichwill enable others skilled in the art to which it appertains to make anduse the same.

. Our invention relates to improvements in means for maintaining thestrength of refrigerating or cooling mediums, such as brine used inrefrigerating or air cooling apparatuses, and the improvement consistsin the construction and combination of parts substantially ashereinafter described and more particularly pointed out in the claims.

Our improvement is embodied in the construction which is shown in thisinstance as attached to an air cooling system and apparatus, and whereinbrine or chloride of calcium solution combined with ammonia coils isused to maintain a low temperature within an insulated room or coolingtower to cool and dry air which is carried off to distant points forrefrigerating or other purposes. In this process the moisture in the airwhich is cooled is eliminated from the air and is added to the brine orchloride of calcium solution, thereby weakening the strength of saidsolution. As the solution becomes weakened it is customary to add morematerial to bring it up to the required strength so that the sameresults can be obtained.

Our object is to provide means for evaporating the surplus moisture as1t is added to the solution without raising the temperature of thesolution within the cooling tank at any time, and to .maintain the samestrength of the brine at all times In the accompanying drawings a singleview is shown which illustrates a cooling tower A of any suitable kind,but which in this instance is built with a brine tank a at its bottomenclosed within walls I) on which the cooling tower proper c is suported. Said tower has inlet openings d wit fans B mounted on a shaft 6and adapted to take in the air from the outside, shown by arrows, and toforce the air upward and out through discharge pipe C. At the top of thetower and in the line of the passage of the air is a spraying and brinedistributing device comprising perforated pipes D with overflow channelsE arranged beneath the same, as well-as vertical partition walls F tocatch the brine and cause it to flow in athin film to more thoroughlyexpose it to the air, or rather to expose the air to a greater amount ofcooling medium, because the purpose of this distributing arrangement isto cool the air thoroughly and condense all the moisture out of the air.

A brine tank a is provided with the usual ammonia coils G to keep thebrine at a low temperature, and these coils may be connected up in anysuitable manner and are of any well known construction.-

A pump II having pipe connections h with the bottom of tank a and withdistributing device D provide the means for circulating the brine withinthe cooling tower. During this process of, cooling the air the moistureadded to the brine from the air decreases the strength of the brine andincreases the quantity of the liquid within tank a. The surplus brineoverflows through pipe I into a second tank J and the same level of theliquid is maintained in both tanks by the following construction andarrangement of parts. A small pump K having pi e connections 76 with thebottom of the tan; J and with the bottom of brine tank a serves toconvey the brine solution in tank J back to tank a. Tank J is of anysuitable construction, and at the extreme top thereof is placed aheating coil L to heat the brine at the to of said tank to a degree oftemperature su icient to cause an evaporation of the solutionsubstantially equal to the surplus water added to the brine within thecooling tower, and which has been taken from the air during the coolingprocess.

It is a well known and established fact that. the lower strata of anybody of water is colder than the upper strata, and especially if theupper surface is ex osed and open. This fact permits us to emp 0y aheating coil L at the top of tank J to raise the water to a temperaturesullicient for rapid evaporation, 4

whereas the brine within the lower portion of the tank remains at thesame temperature as it is taken from brine tank a. Thus, the brinewithin tank a is maintained at the same level and at the, sametemperature and 'the same strength at all times, all of which isbroughtabout by the arrangement and combination of parts, and especiallytank J having heating coil L at its top.

What We claim is:

1. In an apparatus for maintaining brine or an equivalent solution at aneven strength and temperature a brine tank, combined with heating coilslocated within the upper portion of said tank and said tank having inletand outlet connections at its bottom distantly located from said heatingcoils relatively as shown with the body of the solution between saidcoils and said tank connections, whereby a continuous flow of coldsolution is provided within the bottom of said tank and a highevaporating temperature of the solution is maintained in the top of thetank. 2. In an apparatus for maintaining brine or an equivalent solutionat an even strength and tem erature, a cooling tower and a solution tantherein,'in combination with a secondary tank adapted to hold a deepbody of solution and having supply and return pipe connections at itsbottom with said first tank and provided with evaporating means in itstop portion remotely located from said pipe connections and relativelyas shown with the greatest body of the solution between the saidevaporating means and said su ply and return pipe connections, whereby te excess solution is heated and evaporated at the top of said secondarytank during a continuous flow of cold solution in the bottom of the sametank, and means to circulate the'cold solution through said tanks.

. In testimony whereof we sign this specifio cation in the presence oftwo witnesses.

ALEXANDER P. ORISWELL. ALBERT C. BISHOP.

Witnesses for Criswell: GEORGE J. HELFRrcn, RUDOLPH MEYER.

/Vitnesses for Bishop:

R. B. MosER, 0. A. SELL.

